[5.2] Add missing Toggle inline help button to plugin modal / dialog

[pe7er]

Is your feature request related to a problem? Please describe.

In the back-end a lot of forms have extra information that becomes visible when you click on "Toggle inline help". It will display some description if the language file has a "description" field.

In the back-end you sometimes open a Modal for editing something and those are missing the "Toggle inline help" button. PR https://github.com/joomla/joomla-cms/pull/43296 made by @Ruud68 fixes that for "Edit Plugin Settings"

Describe the solution you'd like

We would like to have the "Toggle inline help" button functionality in every Modal where there's inline help available.